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you are right the web is unlimited. never to be filled up....but...the first few places on the search engine are certainly finite highly limited highly prized... and when someone searches for something if the first few results are filled with sites lifted to those positions without being extremely worthwhile sites, then they are just "pollution"....and WHEN google moves to endless scrolling instead of page1,2,3,4 they will not want all the seo crowd thinking that spamming their way to position 20 is worthwhile...

Google has to clean out the crap or die...try a search for hairdresser new york...... and realise that just a couple of months ago the first 5 pages were completely dominated by directories....... spam.. polution....

google looking at a site's link profile and deciding that it's got too many (any) spammy type links and dropping those links from having any +ve effect on the site's ranking position... ouch that hurts.. but if the site had good traffic - UX then that measure should become more +ve (longer time on site, more page views) relatively and the site should rise again.. because google is sure as hell not doing all this in isolation.. "we" think "panda" and "penquin" but it's way more than that.. its activity and edgerank and other site metrics(try add density, try a total content profile score) and loads of other things google is quite capable of measuring without anything like analytics being on the site (try site loadtimes, keyword density.. focus..recency.)..if those things are good then the site will rise again.. and the tool is an intelligent machine, it's trying things and learning all the time.... it;s refining its own algo... and here's a warning...and the simplest fastest way i could think of getting a site deindexed would be to do the SEO "expert" thing of going out and building loads of "natural links' to replace the links that have been lost....

how easy would that be for google to spot .. LOL...

and try and explain to them that you weren't trying to manipulate the search engine when you ask for a reindexing review..

so expect a secondary round of penquin... to not only remove the worth of spammy links but to completely deindex sites that work too hard to recover their position in the search engine rankings.....i think leslie rohde has it pretty much nailed.. and now is a good time to be getting out the red pen